Improvement in key-hole guards for locks



JOHN B. WHITNEY. Improvement in Key-Hole Guards for Lacks. 128,082.

Patented June18, 1872..

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UNITED -STATES PATENT OFFICE.

JOHN E. WHITNEY, oE NEW YORK, N. Y.

IMPROVEMENT IN KEVHOLE GUARDS FOR LOCKS.

Specification forming part of Letters Patent No. 128,082, dated June 18, 1872.

Specification describing a new and Improved Door-Lock, invented by JOHN B. WHITNEY, of New York city, in the county and State o New York.

In the accompanying dra-wing, Figure 1 is a face view, partly in section, of my improved door-lock. Fig. 2 is a transverse section of the saine. Fig.` 3 is a face view; and Fig.. 4 a transverse section of a modification of the same.

Similar letters of reference indicate corresponding parts.

My invention relates to a lock, in which the outer key-hole may be closed by a sliding plate whenever the key is applied from the inside,

and in which the bolt may also be thrownback by applying the key from the inside when the same has been thrown out orlocked by application of the key from the outside. My invention consists in such a 'combination ot' the slide with the lock-tnmblers and bolt that it isy held by the tumbler-s, and released to be drawn by a spring in front of the outer key-hole, as soon as the tumblers are raised, by the key applied from within, through a plate projecting from the slide will be close to the key, when the same is applied from Without, and prevent the slide from moving while the key is in the outer key-hole.

A in the drawing represents the lock-case, oi' suitable shape `and size. B is the bolt; C, Fig. 1, a tumbler, pivoted at a to the lock-case, and provided with a projecting lug, b, which, catching against a shoulder of the bolt, holds it in its locked or unlocked position. The same lug b of the tumbler catches also in front of an ear, d, of the key-hole slide D. This slide rests on thebolt, and is connected with aspring, e, which tends to draw it forward, i. e., behind the outer key-hole. This outer key-hole is in line with the circular recess f, shown in Fig. 1, and, therefore not in line with the inner keyhole g, as shown in the same figure. A plate, h, projects from the slide D, close to the side ot the outer key-hole, and constitutes, in fact, the actual portion for closing the saine. When the key is applied from without, its spindle will be close to an edge of the plate h, and will prevent ythe spring e from moving said pla-te, even ,when ther lug b 'of the tumbler is by the key raised clear oi' theear d of the slide. When, however, the key is applied through the inner key-hole g, its spindle is not in the way of the plate h, and the slide will, therefore, immediately on the lifting of the tumbler, be drawn by the spring vover the outer key-hole. This is ei'ected whenever the lock is closed from within, and also, when after the the lock has been closed from the outer side, the key is applied from within sufficient to lift the tumbler, but without moving the bolt.

The same principle of invention is shown in Fig. 3, where a series of tumblers, C C, is shown on top ofthe bolt in place of the single tumbler, shown under the bolt in Fig. 1, the slide being on top of the tumbler.

Havingk thus described my invention, I claim as new and desire to secure by Letters Patent- The slide D, having the plate h, connected with the spring e, and held by the lug b of the tumbler, substantially as herein shown and described.

JOHN B. WHITNEY.

Witnesses T. B. MosHER, W. A. GRAHAM. 

